反链 - 引用次数：1参考来源 - 一类偏序集的序理想的个数 The Number of the Order Ideals of a Poset
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Antichain
abstract:In mathematics, in the area of order theory, an antichain is a subset of a partially ordered set such that any two elements in the subset are incomparable. (Some authors use the term "antichain" to mean strong antichain, a subset such that there is no element of the poset smaller than two distinct elements of the antichain.